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Thermal conductivity of bulk ZnO after different thermal treatments |
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| Authors: | Ü Özgür X Gu S Chevtchenko J Spradlin S -J Cho H Morkoç F H Pollak H O Everitt B Nemeth J E Nause |
| Institution: | (1) Department of Electrical and Computer Engineering, Virginia Commonwealth University, 23284-3072 Richmond, VA;(2) Physics Department and New York State Center for Advanced Technology in Ultrafast Photonic Materials and Applications, Brooklyn College of the City University of New York, 11210 Brooklyn, NY;(3) Physics Department, Duke University, 27708 Durham, NC;(4) Cermet, Inc., 30318 Atlanta, GA |
| Abstract: | Thermal conductivities (κ) of melt-grown bulk ZnO samples thermally treated under different conditions were measured using scanning thermal microscopy. Samples annealed in air at 1050°C for 3 h and treated with N-plasma at 750°C for 1 min. exhibited κ=1.35±0.08 W/cm-K and κ=1.47±0.08 W/cm-K, respectively. These are the highest values reported for ZnO. Atomic force microscopy (AFM) and conductive-AFM measurements revealed that surface carrier concentration as well as surface morphology affected the thermal conductivity. |
| Keywords: | ZnO thermal conductivity atomic force microscopy (AFM) conductive AFM |
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